On Saturday, April 5, 2014 11:26:38 AM UTC-4, DerbyDad03 wrote:
dpb wrote:

On 4/5/2014 9:17 AM, dpb wrote:

On 4/5/2014 8:56 AM, DerbyDad03 wrote:

...



What is going to happen when the fault tries to trip the breaker since

the adjacent breaker can't be manually set to the tripped position? In

other words, how is the tripping force on the rigid tie bar going to

deal with the breaker that has no need to trip?



It doesn't--the trip mechanism doesn't require movement--it's a

corollary event the result of the tripping. The other will remain as is;

flipping them both down and back on will reset.



It's a UL reqm't that a tied breaker can't not trip owing to the tie.



That is, to be perfectly clear--the effect of the tie on tripping is

immaterial and the breaker functions as if it weren't there. It doesn't

even try to move the other one; not it's job.



--



Thanks to all for the same answer. Glad to see that there is consensus. ;-)



Next question: the reason for these tied breakers is that there is a

bathroom with a fan/heater/light combo unit. The fan/heater are on one 20A

breaker. The other 20A breaker feeds a GFI and the light in the combo unit

as well as a can light over the shower stall are fed from the load side of

the GFI.


The GFI eliminates the danger from the light fixture over the shower and

the ganged breakers ensure that the entire fan/heater/light unit is dead

since it kills both circuits at the same time.



Do you see anything wrong with this setup?

Personally, I would have just put the light in the fan/heater/light fixture
on the same circuit as the fan/heater with one breaker. Then just use a
second breaker for the GFCI and shower light. That way you have one breaker for the fan/heater/light, one for the GFCI receptacle and shower light,
and no need to tie them together.